Title :

Thermal expansion of liquid Fe-S alloy at high pressure

Author(s) :

Xu, F. [Auteur]
Morard, G. [Auteur]
Guignot, N. [Auteur]
Rivoldini, A. [Auteur]
Manthilake, G. [Auteur]
Chantel, J. [Auteur]
Xie, L. [Auteur]
Yoneda, A. [Auteur]
King, A. [Auteur]
Boulard, E. [Auteur]
Pandolfi, S. [Auteur]
Ryerson, F.J. [Auteur]
Antonangeli, D. [Auteur]

Journal title :

Earth and Planetary Science Letters

Abbreviated title :

Earth and Planetary Science Letters

Volume number :

563

Pages :

116884

Publisher :

Elsevier BV

Publication date :

2021-06-01

ISSN :

0012-821X

English abstract : [en]

Local structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature ...
Show more >Local structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature and compositional range. Precise density measurements collected for increasing temperature allowed us to directly derive the thermal expansion coefficients for liquid Fe-S alloys as a function of composition. In turn, thermal expansion has been used to refine thermodynamic models and to address the crystallization regime of telluric planetary cores by comparing the adiabatic temperature gradient and the slope of the liquidus in the Fe-FeS system. For Fe-S cores of asteroids and small planetesimals, top-down solidification is the dominant scenario as the compositional domain for which the slope of the liquidus is greater than the adiabatic gradient is limited to a narrow portion on the Fe-rich side. However, bottom-up growth of the inner core is expected for S-poor cases, with this compositional domain expanding to more S-rich compositions with increasing pressure (size of the planetary body). In particular, bottom-up crystallization cannot be excluded for the Moon and Ganymede.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Non spécifiée

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2021-05-07T10:13:47Z